Offset mechanism for printing-machines.



M. N. OORMAGK, OFFSET MECHANISM FOR PRINTING MACHINES.

APPLICATION FILED MAY 23, 191] Patented Dec. 23, 1913.

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APPLICATION FILED MAY 23, 1911 Patented Dec. 23, 1913.

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the borough of Brooklyn, in the city and chines, of which'the following is a specifi- This invention relates'to'otfset mechanism perfecting printing press, said means coinent points so that amore effectual removal standing of my improved offset mechanism,

UNITED STATES PANT UFFTCE.

MARK N. COR1VIACK, OF NEW YORK, N. Y., ASSIGNOR- TO C. B. COTTRELL & SONS COMPANY, OF NEWYOB-K, N. Y.. -A CORPORATION OF NEW JERSEY.

OFFSET MECHANISM FOR PRINTING-MACHINES.

Be it known that I, MARK N. Common, a citizen of the United States, and resident of State of New York, have invented a new 'and useful Offset Mechanism for Printing-Macation.

for printing machines'and has for its object to provide novel means for 011mg and cleanlngthe second impression cylinder of a web prising separate oiling and cleaning devices arrangedto act upon the cylinder at d1fijerof'the ink from the cylinder and a more effectual oiling ofthe cylinder may be obtained, the supply of oil for oiling the cylinder being kept comparatively free of ink thus presenting 'a cleaner cylinder to the web as it passes around the same from the first printing couple.

A further object is to provide certain improvements 'in' the construction, form, an rangement and operation of the several parts whereby an effectual oiling of the en tire area covered by the printed web and'an effectual cleaning of the entire area is accomplished.

This invention is shown in connection with aprinting press having its second impression cylinder provided with a plurality of shifting tympans, theseparateoiling and cleaning devices ac ing on said tympans.

In the accompanying drawings, Figure 1 represents in side elevation so much of a printing press as will give a clear under- Fig. 2 is a partial plan view of the same, Fig. 3 is a detail section showing a part of the driving mechanism, and Fig. 41s a diagrammatic section showing the relationship of the several parts. I The first form cylinder is indicated at l and its first impression cylinder at 2. The second form cylinder is indicated at 3 and its second impression cylinder at 4:. This seccnd impression cylinder 4 is provided with a plurality of. shifting tympans 5, the mechanism for shifting the tympansnot being shown as it forms no part of the present invention. v

The means for oiling and cleaning th 1 surfaces of' the tympans 5 includes separate Specification of Letters Patent.

Application filed May 23, 1911. Serial No. 629,046.

Patented Dec. 23,1913.

oiling and cleaning devices arranged to engage the cylinder at different points in its circumference. The cylinder oiling device co-inpriscs an oil fountain 6, its fountain roll 7. dnctor roll 8 and oil applying roll 9. This oil applying roll may be made of any desired materialg such, for instance, as'thelusual composition or felt. A scraper 10 for the fountain roll 7 is mounted on the fountain 6, which scraper may be adjusted toward and ELWilYflOlTl the fountain roll and held in such adjustment by fastening devices 11.

The oiling device also includes a rotary brush 12 arranged to engage the cylinder afterthe oil has been applied thereto by'the' roller 9, which brush is adapted to spread the oil thoroughly into all the depressions not reached by the roll 9. This brush may be made of bristles, material. i

The cylinder cleaning device comprises an oilfountain 13, its fountain roll 1 1 and an ink removing roll 15, which ink removing roll contacts with the cylinder 4 and also with the f0 ntain roll 14:. A scraper 16'is' alsoprovide for the fountain roll 14, which scraper is mounted on the fountain 13. The scraper 16 may be adjusted toward and away from the fountain roll 1 1 and may be secured in its adjustment by suitable fastening devices 17. This cleaning device also inwirc, or other suitable cludes a rotary brush 18, which brush may engage the cylinder 1 or the roll 15 or both, as may be desired. In the present instance,

this brush is shown as engaging both thecylinder 4 and the roll 15 and its purpose is first to assist the roll 15 in'picking up as much ink as possible from the cylinder 4;

and secondly washing the ink from, the roll 15 back into the fountain 13 so as to present a clean surface on said roll 15 to the cylinflex. This roll 15 may be made of composi tion or felt or other desirable material and the rotary brush 18 be made of bristles, wire, or other suitab e material.

The means which I have shown for operating the several parts are as follows The shaft 19 of the'cylinder 4 is provided with large gears 20, 21. ,The ge'ar 20 drives agear 22 on the shaft 23 of the oil applying roll 9 and also drives a gear 24 on the shaft 25 of the rotary brush 18. The gear 21 drives a, gear 26 on the shaft 27 of the rotary brush 12. This gear 21 also drives a gear 28 on the shaft 29 of the ink removing of which is guided by the shaft 19 and the upper end of which is connected to one arm 37 of a vibrating lever, the other arms 38 of which carry the ductor roll 8.

An intermittent rotary movement is imparted to the fountain roll 7 by roviding a ratchet 39 fixed to the fountain roll shaft 40 and providing a pawl 41 on one arm 42 of a rock lever, the other arm 43 of which is connected by a rod 44 eocentrically to the box cam. 33, which thereby forms a crank connection for said rod 14. The amount of this intermittent movement for the fountain roll 7 may be provided for by adjusting the hook end of the rod 1 1 toward and away from the axis of the cylinder 4.

In operation, the amount of oil applied to the .ductor roll 8 by the fountain roll 7 from the fountain 6 is adjusted by the scraper 10. At predetermined intervals this ductor roll 8 will transfer the oil to the roll 9, which roll will apply the oil'to the surface of the cylinder l. The cylinder in its rotation will pass beneath the rotary oil spreading brush 12, which brush will spread the oil into the depressions in the surface of the cylinder not reached by the roll 9. This oiling device is preferably arranged to act on the cylinder just before the web reaches the same. After the web has left the cylinder, the cleaning device will act upon the cylinder. Preferably the rotary brush 18 will be engaged with the cylinder so as to Copies of this patent may be obtained for brush the ink out of depressions in the surface and soften up the ink so that when the cylinder is engaged by the roll 15 the said roll will readily take the ink off from the cylinder. As this roll 15 passes by the fountain roll 14, the fountain rollwill take off as much ink as possible from the roll 15. Should any ink remain on said roll, the rotary brush 18 will brush the same therefrom, into the fountain 13. The scraper 16 may be adjusted to remove any ink which might not be washed off by the oil in the fountain and which might remain on the fountain roll.

lVhile I have described this invention as applying oil to the cylinder, it is to be understood that any suitable liquid may "be employed'without departing from thespirit and scope of my invention.

What I claim is 1. An offset mechanism for printing machines including in combination a cylinder,

a device for applying oil thereto at one point and a device for cleaning the ink therefrom at another point, said cleaning device comprising an oil fountain, a fountain roll, an ink removing roll contacting with the cylinder and fountain roll and a rotary brush. 2. An offset-mechanism for printing machines including in combination a cylinder and a device for applying oil thereto comprising an oil fountain, a fountain roll, a ductor roll, an oil :applyin roll and a rotary brush engaging thecylin er for spreading the oil thereon.

In testimony, that I claim the foregolng as my invention, I have signed my name 1n presence of two witnesses, this twenty-sec 0nd day of May 1911. j

MARK N. CORMLACK.

Witnesses F. GEORGE BARRY, HENRI O. THIEME.

five cents each, by addressing the commissioner of Patents, Washington, D. G. 

